drivers/mmc/host/of_mmc_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OpenFirmware bindings for the MMC-over-SPI driver
   4  *
   5  * Copyright (c) MontaVista Software, Inc. 2008.
   6  *
   7  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/device.h>
  13 #include <linux/slab.h>
  14 #include <linux/irq.h>
  15 #include <linux/of.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/spi/spi.h>
  18 #include <linux/spi/mmc_spi.h>
  19 #include <linux/mmc/core.h>
  20 #include <linux/mmc/host.h>
  21
  22 MODULE_LICENSE("GPL");
  23
  24 struct of_mmc_spi {
  25         struct mmc_spi_platform_data pdata;
  26         int detect_irq;
  27 };
  28
  29 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
  30 {
  31         return container_of(dev->platform_data, struct of_mmc_spi, pdata);
  32 }
  33
  34 static int of_mmc_spi_init(struct device *dev,
  35                            irqreturn_t (*irqhandler)(int, void *), void *mmc)
  36 {
  37         struct of_mmc_spi *oms = to_of_mmc_spi(dev);
  38
  39         return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
  40                                         IRQF_ONESHOT, dev_name(dev), mmc);
  41 }
  42
  43 static void of_mmc_spi_exit(struct device *dev, void *mmc)
  44 {
  45         struct of_mmc_spi *oms = to_of_mmc_spi(dev);
  46
  47         free_irq(oms->detect_irq, mmc);
  48 }
  49
  50 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
  51 {
  52         struct mmc_host *mmc = dev_get_drvdata(&spi->dev);
  53         struct device *dev = &spi->dev;
  54         struct of_mmc_spi *oms;
  55
  56         if (dev->platform_data || !dev_fwnode(dev))
  57                 return dev->platform_data;
  58
  59         oms = kzalloc(sizeof(*oms), GFP_KERNEL);
  60         if (!oms)
  61                 return NULL;
  62
  63         if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0)
  64                 goto err_ocr;
  65
  66         oms->detect_irq = spi->irq;
  67         if (oms->detect_irq > 0) {
  68                 oms->pdata.init = of_mmc_spi_init;
  69                 oms->pdata.exit = of_mmc_spi_exit;
  70         } else {
  71                 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
  72         }
  73
  74         dev->platform_data = &oms->pdata;
  75         return dev->platform_data;
  76 err_ocr:
  77         kfree(oms);
  78         return NULL;
  79 }
  80 EXPORT_SYMBOL(mmc_spi_get_pdata);
  81
  82 void mmc_spi_put_pdata(struct spi_device *spi)
  83 {
  84         struct device *dev = &spi->dev;
  85         struct of_mmc_spi *oms = to_of_mmc_spi(dev);
  86
  87         if (!dev->platform_data || !dev_fwnode(dev))
  88                 return;
  89
  90         kfree(oms);
  91         dev->platform_data = NULL;
  92 }
  93 EXPORT_SYMBOL(mmc_spi_put_pdata);